News
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“TSN Ready” Is Not a Complete Industrial Network Requirement
A switch proposal says “TSN ready,” but the application requires a defined cycle, bounded delivery behavior and interoperability with existing controllers. The phrase does not reveal which functions are implemented, which profile applies or how the system will be configured and tested. Time-Sens...Read more -
Eight Ports Do Not Always Mean Eight Available Device Connections
An eight-port switch looks sufficient for eight devices until the design also needs an uplink. Add a second connection for redundancy, a maintenance interface or a shared copper/SFP combo arrangement, and the available endpoint count can be lower than the number the buyer first had in mind. Port...Read more -
Does Energy Efficient Ethernet Affect Industrial Network Latency?
An intermittent delay after a quiet period invites a familiar suggestion: turn off Energy Efficient Ethernet. Sometimes that is a worthwhile experiment. It is not a diagnosis, and applying it everywhere can remove an energy-saving feature without explaining the application's behavior. A str...Read more -
Small Pings Work, Large Transfers Stall: Finding an MTU Mismatch
A successful small ping can create false confidence. The address is reachable, the link is up and the first application connection opens. Then a backup stalls, a file transfer repeatedly retries, or a device sends short status messages while larger messages disappear. One possible explanation is...Read more -
Port Mirroring for Troubleshooting: Make Sure the Capture Is Not Losing the Evidence
A packet capture shows gaps, retransmissions or missing replies. That may explain the application fault—but first check whether the observation system lost the packets itself. Port mirroring copies selected traffic to a monitoring destination. The source traffic and the copy do not necessarily f...Read more -
Fiber Between Buildings: Plan the Data Link and the Local Power at Both Ends
Connecting a warehouse to an office looks like one network link on a drawing. In the field, it becomes a cable route, two optical interfaces, two powered locations and a maintenance responsibility that spans both buildings. Fiber is often considered for this task because it supports optical data...Read more -
Why Two 1 Gb/s LACP Links Do Not Make One 2 Gb/s Transfer
Two Gigabit links are active in the aggregation group, but a single file transfer still stays below one Gigabit per second. The second link is mostly quiet. That result can be entirely consistent with the design. In a conventional flow-based link aggregation arrangement, the device selects a mem...Read more -
One Extra Ethernet Cable Can Stop a Network: A Practical Loop-Prevention Review
A technician adds a spare cable between two cabinets to improve reliability. Minutes later, unrelated devices become unreachable and switch activity indicators appear continuously busy. The new cable may have created a Layer 2 loop rather than a usable backup path. Ethernet redundancy needs an a...Read more -
VLAN Works Locally but Fails Across the Uplink: Check Tags in Both Directions
Two devices communicate when connected to the same switch. Move one to the next cabinet and communication fails, even though the uplink is up and both switch menus show the VLAN number. The missing detail is often how frames enter and leave that uplink. A VLAN existing in a configuration is not ...Read more -
BiDi SFP Pairing: Match Both Wavelength Directions Before Ordering
A single-fiber link stops working after one SFP is replaced. The replacement has the same speed, the same advertised distance and the same connector. The missing detail may be the direction of its wavelengths. BiDi transceivers send and receive over one fiber by using a compatible wavelength arr...Read more -
IGMP Snooping Is Enabled—Why Is Multicast Video Still Flooding?
The switch's IGMP snooping checkbox is enabled, but camera traffic still appears on ports with no viewers. Another installation has the opposite symptom: video starts correctly and disappears several minutes later. Neither fault can be resolved reliably by checking the same box again. IGMP ...Read more -
Fiber Link Budget Calculation: Why a 10 km SFP May Not Fit a 6 km Route
The route is six kilometres long. The proposed SFP is described as a ten-kilometre module. That sounds like four kilometres of spare capacity, but distance is not an optical power margin. The receiver must obtain a signal within its specified operating range after the complete path has introduce...Read more
